Cointaker has the PinballSideMirrors on their primary site as well - https://cointaker.com/t/side-mirrow
I received a couple sets in about 4 days within ordering with one of those days being a holiday and non-expedited shipping. Same ol' PinballSideMirrors quality I had on others..
They could probably do a better job with the old site, put in a redirect or a "we've moved" page in, they must be hoppin' over there or I wonder if there's some sort of technical drama in getting a clean hand-off of the site? total speculation.
Side note, there must be something weird going on with side mirrors on the supply side. Pingraffix has been out of stock on their mirror'd art blades for about 2 months, now. I wanted to put a set of the Pingraffix blades on a game for SFGE but no dice.